F24 System Wide Change: Glibc locale subpackaging

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= Proposed System Wide Change: Glibc locale subpackaging  =
https://fedoraproject.org/wiki/Changes/Glibc_locale_subpackaging

Change owner(s):
* Mike Fabian <mfabian At redhat DOT com>
* Siddhesh Poyarekar <spoyarek AT redhat DOT com>
* Carlos O’Donell <codonell AT redhat DOT com>

This change should make it possible to install or uninstall locales
individually.

== Detailed Description ==
Currently the file /usr/lib/locale/locale-archive contains all locales
and is thus huge (103MB).
For small systems (and containers) it would be useful to be able to
install only a small number of locales.
Recently we made it possible to install a small number of locales by
supplying the rpm-macro “_install_langs”, for example

   rpm -i -D _install_langs="en:de_DE" glibc-common.rpm

will install all English locales and all German locales which start
with “de_DE”,

   rpm -i -D _install_langs="en_US.utf8" glibc-common.rpm

will install only the en_US.utf8 locale,

   rpm -i -D _install_langs="POSIX" glibc-common.rpm

will install nothing (but the POSIX/C is still available because it is
builtin into glibc).

But this approach works only during an Anaconda based install when
Anaconda supplies the _install_langs rpm-macro.
When glibc is updated later, the _install_langs macro will not be
supplied on the command line during the update and the default value
“all” of “_install_langs” from /usr/lib/rpm/macros will be used and
all locales come back during an update.
Therefore, this solution is far from perfect.
It should be made possible to install and uninstall locales
individually, for example by having a separate package for the locales
for each language. Installing such a package would add these locales
to locale-archive, uninstalling it would remove them.

Anaconda then needs to be changed to handle such language packages.

== Scope ==
* Proposal owners:
   1. Figure out the best approach to to install/uninstall locales
   2. Make sure that locales added manually by the user are not
destroyed (currently they are lost when glibc is updated)
* Other developers:
   Anaconda needs to be made aware of the new approach to handle
installation/uninstallation of locales
* Release engineering:
   I am not sure whether this has affects release engineering,
probably the packages in the install image change when parts are split
out of glibc-common.
* Policies and guidelines:
   No, this change does not require updates to policies and guidelines.
* Trademark approval: not needed for this Change
-- 
Jan Kuřík
Platform & Fedora Program Manager
Red Hat Czech s.r.o., Purkynova 99/71, 612 45 Brno, Czech Republic
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